The rules that use the category "<bearing_spec-three_dig>" are:

<bearing_range>

<bearing_spec-three_dig>

<bearing_spec-three_dig> <range>

<bearing_spec-three_dig> <range> <reference_point>

<bearing_spec-three_dig> <range> from <reference_point>

<reference_point> <bearing_spec-three_dig> <range>

from <reference_point> <bearing_spec-three_dig> <range>

pigeons to <reference_point> <bearing_spec-three_dig> <range>

<heading-three_dig-not_prefix>

<bearing_spec-three_dig>